linux-kernel - Re: [PATCH bpf-next v4 28/30] bpf: eliminate rlimit-based memory accounting infra for bpf maps

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Message-ID: <20200821231518.GC2250889@carbon.dhcp.thefacebook.com>
Date:   Fri, 21 Aug 2020 16:15:18 -0700
From:   Roman Gushchin <guro@...com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
CC:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>, <linux-mm@...ck.org>
Subject: Re: [PATCH bpf-next v4 28/30] bpf: eliminate rlimit-based memory
 accounting infra for bpf maps

On Fri, Aug 21, 2020 at 11:23:21AM -0700, Alexei Starovoitov wrote:
> On Fri, Aug 21, 2020 at 08:01:32AM -0700, Roman Gushchin wrote:
> >  
> > diff --git a/tools/testing/selftests/bpf/progs/map_ptr_kern.c b/tools/testing/selftests/bpf/progs/map_ptr_kern.c
> > index 473665cac67e..49d1dcaf7999 100644
> > --- a/tools/testing/selftests/bpf/progs/map_ptr_kern.c
> > +++ b/tools/testing/selftests/bpf/progs/map_ptr_kern.c
> > @@ -26,17 +26,12 @@ __u32 g_line = 0;
> >  		return 0;	\
> >  })
> >  
> > -struct bpf_map_memory {
> > -	__u32 pages;
> > -} __attribute__((preserve_access_index));
> > -
> >  struct bpf_map {
> >  	enum bpf_map_type map_type;
> >  	__u32 key_size;
> >  	__u32 value_size;
> >  	__u32 max_entries;
> >  	__u32 id;
> > -	struct bpf_map_memory memory;
> >  } __attribute__((preserve_access_index));
> 
> hmm. Did you build selftests?
> 
> progs/map_ptr_kern.c:45:14: error: no member named 'memory' in 'struct bpf_map'
>         VERIFY(map->memory.pages > 0);
>                ~~~  ^
> progs/map_ptr_kern.c:25:8: note: expanded from macro 'VERIFY'

Oops, thanks, will fix in v5.